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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) Supplier | Apr. 02, 2017 USD ($) | Dec. 31, 2017 USD ($) Supplier | Jan. 01, 2017 USD ($) | Jan. 03, 2016 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |
Reporting period, minimum |  |  |  | 364 days |  |
Reporting period, maximum |  |  |  | 371 days |  |
Unrecognized tax benefits |  |  | $ 0 |  |  |
Cumulative effect adjustment to retained earnings |  |  | $ 0 |  |  |
Retained earnings |  | $ 112,424,000 |  | $ 112,424,000 | $ 124,363,000 |
Estimated gift card redemption period |  |  |  | 20 quarters |  |
Outstanding gift card liabilities |  | 5,700,000 |  | $ 5,700,000 | 5,300,000 |
Advertising expense, net of co-operative advertising allowances |  |  |  | 37,900,000 | 38,200,000 | $ 39,800,000
Co-operative advertising allowances |  |  |  | 5,600,000 | 5,900,000 | 6,000,000
Cash equivalents |  | 0 |  | 0 |  |
Long-lived assets to be held and used |  | 500,000 |  | 500,000 |  |
Impairment of store assets |  | 600,000 |  | 602,000 | 0 | 192,000
Self-insurance liabilities |  | 11,600,000 |  | 11,600,000 | 11,600,000 |
Accrued interest or penalties |  | 0 |  | 0 | 0 |
Cash deposits insured by the Federal Deposit Insurance Corporation |  | $ 250,000 |  | $ 250,000 |  |
Concentration risk, suppliers | Supplier |  |  |  | 700 |  |
Concentration risk, largest supplier | Supplier |  |  |  | 20 |  |
Suppliers accounted for total purchases |  | 40.90% |  | 40.90% |  |
Percentage of vendors represented greater than of total purchases |  |  |  | 5.00% |  |
Vendor represented greater than of total purchases | Supplier |  | 1 |  | 1 |  |
One vendor [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Suppliers accounted for total purchases |  | 11.00% |  | 11.00% |  |
Accrued expenses [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Self-insurance liabilities |  | $ 4,600,000 |  | $ 4,600,000 | 4,700,000 |
Other long-term liabilities [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Self-insurance liabilities |  | $ 7,000,000 |  | 7,000,000 | 6,900,000 |
Gift Card Breakage Revenue [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Recognized gift card breakage revenue |  |  |  | $ 400,000 | $ 400,000 | $ 400,000
ASU No. 2014-09 [Member] | Scenario Forecast [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Retained earnings | $ 700,000 |  |  |  |  |
Inventory cost | $ 1,300,000 |  |  |  |  |

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